verb (used without object), ser·mon·ized, ser·mon·iz·ing.
verb (used with object), ser·mon·ized, ser·mon·iz·ing.
Examples from the Web for sermonise
Both generals, in the intervals of actual war, sermonise each other, and with much the same spirit that they fight.
You used occasionally to sermonise too; I wish you would, in charity, favour me with a sheet full in your own way.The Letters of Robert Burns|Robert Burns
It is easy to produce sermons in stones, easy to sermonise in very many ways; but Jocelin did not preach.Bell's Cathedrals: The Cathedral Church of Wells|Percy Dearmer
British Dictionary definitions for sermonise
Word Origin and History for sermonise
1630s, from Medieval Latin sermonizari, from Latin sermo (see sermon). "Chiefly depreciatory" [OED]. Related: Sermonizing.